I noticed that you did your first weigh in today. Congratulations!
I too weighed over 300 pounds when I first started this journey many years ago. Today, after many ups and downs, I'm close to my goal of 170 pounds. (I reached it last year, but had a backslide this winter.) I just want to share with you, that with the help of Fatsecret, the many positive members and a great tool for keeping track of things, YOU CAN DO THIS too!
I don't know who said it, but I found this quote very inspiring: "You don't have to be great to start, but you have to START TO BE GREAT".
Good luck to you!